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xtruss · 10 months ago

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Ship Noises Mute the Songs of Humpback Whales

Drowned out by the din of passing ships, humpback whales attempting to breed off the coast of Japan are cutting their conversations short.

— By Katherine J. Wu

A Humpback Whale breaching near Stellwagen Bank National Marine Sanctuary in Massachusetts Bay. These whales may be imperiled by the sounds of passing ships, which silence their songs during mating season. Photo Credit: Whit Welles, Wikimedia Commons

With Its Enigmatic Chorus of Clicks, Groans, and Whistles, the haunting opus of the humpback whale (Megaptera novaeangliae) is one of the ocean’s most striking sounds. Every winter, humpbacks may swim thousands of miles to their seasonal breeding grounds, where males competing for mates fill the waters with soft serenades. But off the coasts of Japan, these seas are falling silent—and it seems humans are to blame.

Today, in the journal PLOS ONE, researchers report that the noises emanating from human-operated cargo ships disrupt the mating songs of humpback whales. Drowned out by the underwater din, some whales are even going completely mum in the vicinity of these vessels—which could have serious consequences for their reproductive success.

Beneath the surface of the sea, light falters fast. But because sound travels faster in water than air, keen audiophiles like the humpback whale use sound to navigate the dimly lit underwater world. These gentle giants engage in casual chatter year-round, but breeding season tends to feature prominent displays of song from males. Whale compositions are exquisitely complex, with at least 34 distinct sound types in the repertoire. Males will carefully remix their melodies as the years go by, and even pass tunes from population to population like vocal culture.

Despite all this, scientists still aren’t entirely sure why male humpbacks sing. Though musicality surges during periods of mating, song could serve a multitude of purposes, from gruff territorial warnings to come-hither calls. Whatever the whales’ rationale, it’s clear that song is crucial: Once they’ve warmed up, humpbacks can sing for hours on end, their ghostly echoes reverberating up to 100 miles through the surrounding sea.

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But when humans enter the mix, being pitch perfect can be a double-edged sword. Unnatural noises from technological advancements like seismic airguns and military sonar have permanently disabled—and even killed—whales and their seafaring relatives.

Even the low-frequency hum of ships appears to perturb whales in conversation. The drones emitted by these ships can actually overlap with the frequencies of whale song, making it more difficult for humpbacks to pick out important bits of intel from the surrounding cacophony—the underwater equivalent of struggling to hear a friend in a busy restaurant.

Several researchers have observed whales changing their behavior in the presence of ships. However, compared to unmistakable consequences from airguns and sonar, it’s been challenging to reach a consensus on the extent of the effects of these more muted sources of noise, explains study author Tomonari Akamatsu, a biologist at the Japan Fisheries Research and Education Agency. In shipping hubs that see a lot of traffic, for instance, it’s difficult to disentangle which among the many possible disturbances are most problematic.

But the small outpost of Chichijima in Japan’s Ogasawara Islands presented a rare opportunity for Akamatsu and his colleagues. Separated from the southeastern coast of Japan by over 600 miles, the 2,000 or so residents of Chichijima receive just one daily ship: the Hahajima Maru, a small passenger-cargo vessel that ferries in a regular supply of goods and people from afar.

For the most part, the waters in this remote part of the world are quiet. But each winter, the seas swell with the symphony of hundreds of humpback whales eager to mingle with their mates—giving the researchers the chance to observe the effects of a single ship on the behavior of a wild population. The pristine nature of this locale stripped away other variables that could muddy the waters—other vessels, for instance, or inconsistent traffic.

“This study presents a really special and unique situation,” says Rosalind Rolland, a whale expert and veterinarian at the Anderson Cabot Center for Ocean Life at the New England Aquarium who did not participate in the research. “It’s very difficult to find anywhere in the ocean where there is just a single source of ocean noise. Most times there is noise from all directions.”

By placing two recorders in the waters near Chichijima, the researchers captured a series of whale vocalizations between the months of February and May 2017. Each day, they recorded one or two male humpbacks, amassing tracks of 53 soloists in total—half in the presence of the ship, and half without. The team also used the recordings to pinpoint the whales’ positions relative to the machinery as they sang, tracking their movements through time.

When the team mapped out the whales’ responses, the results were sobering. If the vessel was present, it produced, at its loudest, about 150 decibels of noise, comparable to the volume of a shotgun—and humpbacks seemed to shirk from its path, vacating the areas closest to the shipping lane. The whales that remained within 1200 meters of the ship produced fewer sounds overall. Some even cut their serenades off entirely—and most who did still hadn’t resumed their songs half an hour after the ship had passed through.

Humpback Whales rely on sound to communicate in the dark ocean waters. During their winter breeding season, males will sing for hours on end—but their serenades may be stifled by the sounds of passing ships. Photo Credit: Christopher Michel, Flickr

Akamatsu had initially assumed that in the presence of the ship, the humpbacks would raise their voices or change the frequency at which they sang—both strategies that might enable whales to discern calls above the clang and clamor. But, he says, perhaps this reticent response is an adaptive, energy-saving strategy.

“It’s actually very clever,” Akamatsu explains. “They know it’s temporary, so they just wait for it to pass.”

Vocal adjustments, after all, are exhausting. Even 500 to 1200 meters away from the ship, the whales were still contending with a noise level of about 100 decibels—roughly equivalent to a motorcycle or a raucous rock band. Perhaps, instead of attempting to outperform the uproar, humpbacks were simply waiting out the storm.

Every whale who stopped his song did eventually rebound from the chorus interruptus—and such resilience may spell tentatively good news for the residents of Chichijima, who remain tied to the Hahajima Maru’s regular visits. “This ship is a lifeline for an isolated island,” Akamatsu explains. “Humans need that ship to survive.”

But Michelle Fournet, a wildlife scientist in the Bioacoustics Research Program at Cornell University, points out that it’s also possible the humpbacks’ silence may not be indicative of flexibility at all. Muted by the regularity of passing ships, whales may be running out of sustainable strategies to cope, and instead accepting defeat. While bellowing above the fray may be exhausting, it at least offers whales a fighting chance of still being heard. Complete silence, on the other hand, brings the probability of communication down to zero. If humpbacks want any shot at coupling up, they can only wait so long for ambient noise to die down.

“Humpbacks have to contend with a lot of variability,” says Fournet, who was not involved in the research. “And they’re capable of adapting to natural sounds. But they may not always be able to apply those same strategies to [human-made] noise.”

While no long-term repercussions have yet been found, it will be imperative to measure the ship’s effects on humpback reproduction, Fournet adds. Even though most populations of humpbacks are no longer considered endangered, pods around the world remain vulnerable to human interference. And despite decades of study, researchers are still puzzling through the intricacies of whale song. It’s unclear how disastrous even the tiniest tweaks to a tune could be for humpbacks trying to find each other in the dark.

And, of course, the calm of Chichijima is the exception, not the rule: Most ships don’t sail solo. Acoustic pollution from human-made vessels will likely be on the upswing for years to come, warns Paul Wensveen, a biologist who studies marine acoustics at the University of Iceland. Even technological Band-Aids like insulators, which muffle the sound from ships’ propellers, are quickly overwhelmed by the sheer volume of noise radiating from the world’s busiest ports.

If humankind’s presence in the ocean continues to grow, there may soon be little stopping the whales’ brief intermission in song from turning into an irreversible coda.

“Some of the whales’ strategies have been successful so far,” says Fournet. “But as the ocean gets louder, and more vessels come in, we can only expect to see more changes.”

#Youtube #Nature #NOVA #Humpback 🐋 Whales 🐳#Katherine J. Wu #Stellwagen Bank | National Marine Sanctuary | Massachusetts Bay

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xtruss · 3 months ago

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How Billions of Dollars and Cutting-Edge Tech Are Revolutionizing Ocean Exploration

What lurks beneath the waves? State-of-the-art robots, ships, and submersibles are helping a new generation of explorers finally understand the most mysterious habitat on Earth.

— ByAnnie Roth | August 15, 2024

Sperm Whales can hold their breath for up to an hour and dive more than a mile below the surface. OceanX scientists are interested in how these marine mammals hunt in such deep waters. Photograph By Brian Skerry, National Geographic

On a warm June morning, a 286-foot private research vessel set off from the green and rocky sea cliffs of the Azores, a chain of islands jutting upward from the North Atlantic Ocean, about a thousand miles west of mainland Portugal. The gleaming white OceanXplorer, rising high above the water, resembled a modified superyacht, with a helicopter pad on the bow and a pair of yellow submersibles near the stern. Below the surface, the ship’s hull featured a high-resolution sonar array to map underwater terrain.

The OceanXplorer had embarked on a unique mission: to tag and retrieve data from bluntnose sixgill sharks in their natural environment, an area so deep that much of their behavior remains a mystery. These prehistoric predators, whose ancestors first appeared 200 million years ago, can grow up to 18 feet long. They’re concealed within the ocean’s mesopelagic layer, or “twilight zone”—a frigid region reaching 3,000 feet down that’s nearly devoid of light. Still, each evening, the slow-moving yet buoyant sixgills here make a three-hour journey up to shallower waters to feed at a known hunting spot on the ledge of an undersea mountain near the Azores.

Top: OceanXplorer is a vessel with a helicopter, submersibles, and small boats for research missions. Here, deck safety officer Derek McQuigg operates a small craft in Sognefjorden, Norway’s longest and deepest fjord. Photograph By Taj Howe, OceanX

Bottom: A submersible launched from the OceanXplorer illuminates seafloor terrain in the Red Sea. Underwater geologic features are difficult to explore, but submersible and ROV technology allows scientists to study them up close. Video Still, OceanX

OceanX scientists, including Melissa Márquez, attempt to attach a camera tag to a sixgill shark from a submersible at a depth of more than 800 feet. They journeyed so deep hoping to capture the shark’s natural behavior. Video Still: OceanX

On board were nearly 70 crew members, including shark biologist Melissa Márquez, who grew up in Mexico; deep-sea researcher Zoleka Filander, a South African ecologist who has discovered several new species of invertebrates; ocean technology inventor Eric Stackpole, a NASA veteran who co-founded an underwater robotics company; and two guest scientists from Portugal’s University of the Azores, Jorge Fontes and Pedro Afonso, who had developed a tag that tracks sharks and provides video.

The team hoped to locate at least one sixgill, attach a camera tag to it, and then retrieve the tag later—something never accomplished before in the deep sea. It would require a series of dives in one of the onboard “bubble subs”— so called because of the acrylic globe that houses passengers. Even then, they would get only a glimpse into this hidden world; the tag would automatically release after 12 hours and float to the surface for recovery. Recovering the data, however, would mark a scientific first, yet another in a series for the team, which works with the nonprofit initiative OceanX. Over the past few years, its researchers have taken dramatic footage of orcas hunting humpback whales and separately made audio recordings of how male humpbacks might use undersea terrain to amplify their mating songs. They have also captured rare footage of the Dana octopus squid in its natural habitat.

If such moments sound particularly entertaining—sharks! whales!—that was by design. The OceanXplorer is the flagship of OceanX, an exploration and media venture co-founded by Ray Dalio, the billionaire founder of the hedge fund Bridgewater Associates, and his son Mark, who has previously co-produced shows for National Geographic. The group launched in 2018 with the stated goal to “explore the ocean and bring it back to the world.” This has involved converting a former Norwegian support vessel for oil rigs into a mobile scientific research center and film set. OceanX advisers include James Cameron, the Hollywood director of Avatar and Titanic.

A Mother Humpback Whale will stay with her Calf for about a year. The nonprofit OceanX filmed one pair being hunted by orcas and investigated whether the shape of the seafloor amplifies the humpback whale’s song. Photograph By Brian Skerry, National Geographic Image Collection

Beyond the helicopter and the bubble subs, which can take explorers to 3,280 feet underwater, the vessel also carries a remotely operated vehicle (ROV) for filming far deeper, plus its own wet and dry laboratories and a holographic viewing table for researchers to generate seemingly made-for-TV models of the data they collect from the deep ocean. There are more than 3,000 film-quality light fixtures throughout the boat. And starting in August, viewers around the world can tune in to see the result of the sixgill expedition, which is part of the National Geographic series OceanXplorers. “There’s never been a more urgent need to understand our ocean and the animals that call it home,” Cameron narrates in the series. “Because their lives, and ours, depend on it.”

OceanXplorers is inspired by the work of Jacques-Yves Cousteau and Louis Malle, who together released the film version of Cousteau’s best-selling book The Silent World nearly 70 years ago. The documentary was among the first underwater films shot in color and sparked worldwide interest in the ocean. That included Ray Dalio, who was entranced by Cousteau’s work and has shared that enthusiasm with his son. “How do you create a Cousteau moment for the modern age?” says Mark Dalio.

The modern age could use an updated Silent World. New technologies are on the cusp of unlocking scientific breakthroughs, but only if they’re funded—which means people need to care and demand action. Spurring that through a series of six 30-minute-plus episodes might sound a bit far-fetched, but as the footage reveals, each journey can lead to even more surprising discoveries.

Advancements In Ocean Exploration Through The Ages:

Top Left! 2012: Filmmaker and Explorer James Cameron exceeds the 1960 depth record at Challenger Deep, which was then surpassed by Victor Vescovo in 2019. Photograph By Mark Thiessen, National Geographic Image Collection

Top Right! 1970: Scuba gear allows scientists like National Geographic Explorer at Large Sylvia Earle to spend hours underwater. Photograph By Bates Littlehales, National Geographic Image Collection

Middle Left! 1934: Engineer Otis Barton and naturalist William Beebe dive below 3,000 feet, a human first, in a vessel called a bathysphere off the coast of Bermuda. Photograph By William Beebe, National Geographic Image Collection

Middle Right! 1960: Jacques Piccard and Don Walsh are the first to visit Challenger Deep, the lowest region of Earth’s oceans. Photograph By AFP Via Getty Images

Bottom Left! 1977: U.S. scientists discover hydrothermal vents via an underwater camera and temperature sensor. To their surprise, life thrived in this sunless environment. Photograph By Rov Subastian, Schmidit Ocean Institute

Bottom Right! 2024: Caltech engineers test the potential of bionic jellyfish—live jellies equipped with sensors to record information as they swim. Photograph By David Liittschwager, National Geographic Image Collection

At around 10:30 p.m., cameras rolled from all angles as the Neptune, one of the OceanXplorer’s three-person bubble subs, dangled from a large crane, suspended over the dark ocean. Inside, Márquez, the shark biologist, sat near Afonso, a marine ecologist, and a submarine pilot. Márquez and Afonso had never had the chance to scout for sixgills directly from a sub. Multiple cameras captured the researchers’ wide-eyed expressions as the submersible dropped into the ocean and quickly disappeared below the surface.

Step one in tagging a sixgill: Conduct a population survey in the area, where the sharks are known to convene at night after spending their days deeper in the ocean.

After Márquez and Afonso descended to a ledge more than 800 feet down, they saw something large moving past their submersible’s headlights.

“Shark, shark, shark!” Márquez called out, looking both excited and a little startled. “That’s huge. Adult. Definitely an adult. About 15 feet long.”

She could see right away that the animal was female because of the lack of claspers, or sexual organs, under its pelvic fin.

Over the course of eight hours under water, the team spotted 11 sixgills, which had traveled an estimated 1,800 feet upward to look for food. Each shark seemed to have a different temperament, with some keeping their distance and others swimming directly at, or even right below, the sub.

They were also all female, except for one juvenile male, supporting the idea that the animals may travel in single-sex groups outside of mating season.

None of the potential targets moved quickly. “She’s so sluggish,” Márquez said as one of the sharks passed by, illuminated by the light of the sub. “I guess she’s conserving her energy. And it’s cold out there; it’s only 39 degrees.”

The Deep Sea Still Has Plenty of Mysteries to Reveal. It is the largest habitat on Earth, comprising more than 95 percent of the ocean, yet remains the least explored. At the first ever United Nations Ocean Conference, in 2017, an international coalition of scientists announced its intention of using multibeam sonar to generate a detailed map of the seafloor in its entirety by 2030.

When the initiative was first introduced, only 6 percent of the seabed was mapped to an adequate resolution; that figure now is 25 percent mapped in high resolution, with more terrain being added every day.

That effort may reveal a better understanding of the seafloor, but when it comes to ocean conservation, researchers face the additional challenge of trying to protect an ecosystem that’s still not well surveyed. The vast majority of species in the ocean—by one estimate, more than 90 percent—have yet to be classified. Rather than just cataloging discoveries, ocean-exploration entities have also put effort into better relaying the wonder of the unknown. By 2019, private equity investor Victor Vescovo piloted a submersible to the lowest point of all five ocean basins, setting a record for the deepest crewed dive in history when he reached the bottom of the Mariana Trench in the Pacific Ocean, at a depth of nearly 36,000 feet.

Great Hammerhead Sharks (at left and bottom) cruise along the seafloor in the Bahamas. Scientists are scrambling to learn more about these critically endangered creatures. The OceanX helicopter crew followed one on a stingray hunt. Photograph By Chelle Blais, Bimini Shark Lab

“We have an ability to see, hear, and sample [the ocean] in ways that we just never had before,” says Chris Scholin, the president and CEO of the Monterey Bay Aquarium Research Institute, a nonprofit oceanographic organization based on California’s central coast.

Submersibles, satellites, drones, ROVs, autonomous underwater vehicles, and undersea observatories are giving scientists and explorers unprecedented access to the ocean. As a result, scientists are discovering an average of 2,000 new marine species each year.

“It’s amazing what’s happened in the last few years,” says Jyotika Virmani, executive director of the Schmidt Ocean Institute, a nonprofit dedicated to science and exploration that recently aided discovery of more than a hundred species believed to be new to science during expeditions to a seamount chain off the coast of Chile. “Things are happening, and they’re happening faster and faster. There’s been an almost exponential increase in information that we’re getting about the ocean.”

Seamounts, the mysterious mountains of the ocean, are hot spots for life like these green feather stars living on deep-sea coral at 3,000 feet, as seen in recent scientific surveys supported by the Schmidt Ocean Institute. Photograph By Rov Subastian, Schmidit Ocean Institute

Other marine creatures observed include a bright red member of the sea toad family that can walk on the seafloor at 4,556 feet and the rarely seen whiplash squid at 3,625 feet. Photographs (Top & Bottom): By Rov Subastian, Schmidit Ocean Institute

One of OceanX’s goals is to telegraph the vast human health and innovation losses that may occur if important species disappear before we can learn more about them. “The ocean is just a huge library of DNA that can be exploited by humans for medical purposes, manufacturing—all kinds of things,” says Vincent Pieribone, OceanX’s co-CEO and a professor at the Yale School of Medicine. Compounds from marine life are actively being investigated for their potential as antibiotic and antiviral medications and even for components of artificial bone.

The majority of the narrative being shared right now is “the obituary of the ocean,” says Philippe Cousteau, Jr., a filmmaker, explorer, and grandson of Jacques-Yves Cousteau. “I think that has held back capturing the public’s imagination.”

After Confirming The Underwater Ledge was a feeding spot for sixgills, the team decided it was ready to tag a shark. Around midnight on another evening, the Neptune shuttled Márquez and marine ecologist Fontes back to the ledge, passing through a shoal of boarfish so dense it temporarily obstructed the bubble sub’s view.

This time, decaying fish had been secured to an extended metal rod, which projected several feet in front of the submersible to entice a sixgill. “Come on, Big Mama,” Márquez said, as if willing a shark to appear.

When the first sixgill arrived, it ignored the bait, focusing instead on a morsel that had become detached and floated to the bottom, and stayed out of range. Some time later, two more sharks appeared, with the larger one chasing off the smaller, probably to protect the new food source. At a certain point, one creature’s large, trapezoidal tail knocked the sub with an audible thump, startling everyone behind the six-and-a-half-inch acrylic hull.

The Neptune was outfitted with a laser-sighted spear gun that could fire a kind of arrow into the skin of the sixgill. Connected to the arrow was the tracker—a small, red, hard-foam package that housed a camera and other sensors capable of monitoring the animal’s speed, depth, and movements for up to 12 hours.

When the larger of the two sharks came into view, Fontes pressed a button to fire the arrow, but it shot wide, narrowly missing the moving target.

“Damn it,” he said.

Márquez grabbed her head. “I can’t believe it,” she said, before signaling that another shark was approaching. With only one arrow left, the pressure was on. This time, Fontes was able to hit the animal’s large torso. Up in the OceanXplorer’s mission control room, Stackpole, the underwater robotics technician, and Afonso watched with excitement and gave each other a high five.

Sixgills Likely Haven’t Changed Much in 200 Million Years and retain features from the Jurassic age. When the tagged shark reapproached Neptune to finish its meal, cameras captured its eyes rolling back into its head as it shook the bait. Unlike many sharks, sixgills don’t have a retractable membrane to protect the eye while hunting; instead their eyes just … roll back. For the crew, it was a visceral reminder of how different these animals are.

Because sixgills are especially buoyant, one working hypothesis for how these sharks hunt has been that they may float upward along ridgelines in the ocean, seeking silhouettes from potential prey that they can ambush.

While the show focused on the red camera tag, it was accompanied by another, more basic satellite tag that could transmit movement data for an additional nine months, allowing the researchers to continue to learn more about the species’ vertical migrations. Such underwater monitoring is important: Although scientists can catch deep-sea sharks with nets or hooks and pull them to the surface, being dragged from the deep can cause potentially fatal pressurization injuries for the creatures. Stressed animals don’t make great study subjects either, which is why scientists at OceanX want to tag them in their environment.

Once reviewed at the mission control room, the data retrieved from the tracker appeared to support the thesis about the sixgill’s hunting method. The shark would travel slowly, with short upward bursts of speed that might signal it was ambushing prey from below.

OceanX missions aren’t all focused on thrashing sharks and whales. Often they pursue the more prosaic business of mapping. While the OceanXplorer tracks sharks and films whales, the vessel is also using its own sonar array to add to the growing body of data about the seafloor. In 2019 OceanX conducted an end-to-end survey of the largest coral reef system alongside the continental United States. It also conducted yet another voyage off the Azores, in 2023, producing yet more findings on underwater seamounts and ridges to support the designation of 30 percent of the region’s economic zone waters as marine protected areas. Scientists working with OceanX have contributed to nearly a hundred research papers, on topics ranging from coral-dwelling crabs to microbial life around hydrothermal vents.

“The sea, once it casts its spell, holds one in its net of wonder forever,” Jacques-Yves Cousteau wrote. At a time when the public’s increasingly short attention span may make it harder to digest complicated information, OceanX is trying to perpetuate that spell.

Dalio, the nonprofit’s co-founder, says he wants OceanXplorers “to be a launch, not just of a series but of a new awareness and excitement about the ocean,” adding he wants to “create a wave” that gets others involved and working together. If that can happen, he says, “we really are on the brink of a golden age for ocean exploration.”

What its scientists share with the public seems to be getting attention: OceanX has more than four million followers on TikTok.

Top: Mystery lurks beneath the waves. Greenland sharks can live for centuries, but little is known about how they hunt and survive in deep, cold Arctic waters. The OceanX crew tagged one to measure its movements. Photograph By Mario Tadinac, National Geographic

Bottom: OceanX science program director Mattie Rodrigue examines a sample on one of the ship’s high-power microscopes. State-of- the-art labs like this one seek to narrow vast knowledge gaps in marine science. Photograph By Andy Mann, OceanX

During Another Dive in the Sub, Márquez and Afonso witnessed a large sixgill skim close to the floor of the ledge. This might be attributed to the animal’s use of highly attuned electrical sensors in its head to detect movements of other creatures in the murk. But instead of seeing the feeding method their data suggested, what happened next was different. The creature quickly inverted, swinging its tail vertically above its head before swinging it back and forth to seemingly pin something against the seafloor. It could have been a ray hiding under the sand.

Back on the OceanXplorer, Márquez and the team talked over just how much that moment defied their expectations. Rather than proving one version right or wrong, the truth is more exciting: The sixgill may have different hunting tactics it can deploy.

“The data from the tag was telling us one thing,” said Márquez, “but our own eyes are telling us something completely different.” It’s an unexpected finding and a reminder of just how much remains unknown.

At Dusk One Day, the Sun Lit up the Rocky Cliffs of the Azores, and the OceanXplorer steered onward, the large vessel backlit by the dimming light that reflected across the vast ocean around it. Eventually, the ship would head back to port to refuel and start another mission, bringing on another group of local scientists to study the deep.

As the ship moved ahead, it looked small against the backdrop of the ocean, which stretched so far that it blended into the glittering horizon line. Almost every day at sea features a moment like this, when, with the right perspective, the enormous vessel suddenly looks small. When you zoom out, there’s always more ocean.

#Underwater Exploration #Oceans 🌊 🌊#Exploreres #Boats 🛶 🚤 🛥️#Orca (Killer Whales 🐋)#Humpback 🐋 Whales 🐋 🐳#Sharks 🦈#Ocean 🌊 Life

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